HARD CHALLENGE NOT FOR WEAK MINDED

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.